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(No Model.) I u2 Sheets-Sheet' .1.

vJ. E. E. EINTON.

MAGNET() ELECTRICAL ALARM,

No. 292,311'. y Patented Jan. 221.884.`

a l f `NITED-STATES PATENT QEEICE.

AJOSEPH R. H. HINTON,OE Y'RALTIMORE, MARYLAND, AssIGNOR To THE vIA DUCTMANUFACTURING COMPANY OE BALTIMORE CITY, OE sAME PLACE. 1 V

MAC-:N ETC- ELECTRICAL ALARM.

SPECIFICATION forming-part of' Letters Patent No. 292,311, dated January22, 1884.

Applicationl filed November 19, 1883. (Xo model.)

To all lwiz/0711, it may concern.-

. Be it known that I, JOSEPH R. H. HINTON, of Baltimore, in the State ofMaryland, have-invented certain new and useful Improvements in '5Magneto-Electrical Alarms; and I do hereby declare that the following isa full, clear, and exact description of the invention, which will enableOthers skilled in the art to which it appertains to make and use thesame, reference IO being had to the accompanying drawings, and

position while the motor isbeing wound up;

2 5 to prevent the motor from running except 'when it is started at theproper time, and to provide for an initial movement of the mechanism inassistance of the weight or spring when.a signal is to be given. Withtheseob- 3o jects in view my improvement consists in certain novelconstructions and combinations of devices, which will be fullyunderstood from the following particular description in connection withthe accompanying drawings, in 3 5 which- Figure lis a vertical sectionof a signal-box, showing a side elevation of the interior mechanism.Fig. 2 is a similar view, showing an elevation ofthe mechanism on theside Oppo- .IO site to that shownfin Fig. 1. Fig. 3 isa horizontalsection of the box and plan View of the interior mechanism. Fig. ,4 is asimilar view, showing in plan the key-retaining device within the box. a5 The letter A indicates the frame which sup- V ports the mechanisminside of the box B.

C is the main driving-shaft, carrying a barrel, D, upon which is wound acord, E, operated by a weight.F/. This barrel is connected 5o with themain gear-wheel Fby theordinary which in turn meshes with a pinion on ashaft,

f2, carrying a gear-wheel, f3, which meshes with a-pinion on the shaft gof the rotary armature G, arranged between the poles of apermanent-magnet, H, said armature being connected up in a well-knownmanner, to send a current through an electrolmagnetic bell, I, and overthe wires P and-N, which are to be connected with the line-wire in theusual manner. K indicates a signal or break lwheel, of usualconstruction, having raised portions or-teeth arranged to makecontactwith a spring contact linger, J, for sending the signals, in amanner Qwell understood by persons familiar with 'electrical fire-alar mmechanism. This break-wheel is mounted on'one end of a short shaft,having Aon itsother end a gear-wheel, L, which meshes "with a pinion, Z,on the main shaft, from which the break-wheel derives its rotary motion.

The parts which I have now referred to are old in construction andrelative arrangement; but when such parts only` are used there areldefects in the operation of the mechanism, which it is the object of myimprovements to Overcome. Forinstance, when the cord is iirst wound uponthe drumy and the mechanism started into operatiomthe weight will causethe main shaftto move at first comparatively slowly, and as" itcontinues to run the acquired momentum results in an increasing rapidityof revolution in the break-wheel, so that the intervals between the signaliug-impulses become less and less toward the end ofthe signal, thusgiving rise to confusion. In order to overcomethis'dificulty I arrange astationary disk,

`M, attached to the frame A. by side' lug and screws, as shown in Fig.2, having an annular flange, m, concentric with the'shai't g of thearmature. This shaft extends centrally through the disk M, and haspivoted to it, at diametrically-opposite points, two curved arms, o o,arranged to be swung Outward by centrifugal force. These arms are soweighted that when the rotation of the armature-shaft reaches thedesired speed they will y outward and imfpinge againstthe iiangemwithsuch friction as IOO to prevent that speed from being exceeded, and auniform speed of rotation is thus secured in the break-wheel, which, asit will be reinembered, is connected with the armature-shaft byintermediate gears. Theposition in which the break-wheel stops aftergiving a signal is that from which it should start' on giving asubsequent signal; but unless some provision is made for holding it insuch position it is liable to be moved therefrom during the winding upof the cord, or a spring, if the latter should be used to give themotive power. I have therei'ore contrived an automatic brake mechanismwhich will prevent all movement of the train while the barrel is beingwound up. The barrel has projecting from one side a sleeve-shaft, C,which lits over the main shaft G and prolject-s outwardly beyond theframe A, as shown in dotted lines, this projecting portion being squaredto receive a key, Q, the barrel q of which hasa corresponding socket toht over this project-ing squared portion of the barrelshaft. To the sideof the frame A from which the barrel-shaft projects is pivoted a bentlever having a long arm, R, tothe outer end ofwhieh is iirmly secured atone end a transverse rod, a', having pivoted upon its other .end abrake-shoe, S, arranged to bear upon the periphery of the gear-wheel f,which meshes with the pinion upon the armatureshaft. The other arm, R',of this bent lever `curves over the squared projecting portion ot' thebarrel shaft in such position that when the barrel or tube of the key isplaced upon this shaft, said tube will force the arm R upward againstthe tension of the springt, and consequently the arm R will be swungdownward, and the brake-shoe carried by the rod 1 will be pressedagainst the periphery of the wheel f with such force as to prevent thetrain from moving as long as the key is in position for winding up thebarrel, and thus closing the winding operation, and the breakwheel,which is connected with the train, will be absolutely prevented frommoving from the position in which it stops prior to the commencement ot'the winding. The tip ot' the key-tube should be beveled in order tofacilitate its passage under the arms R. In the present instance aweight is used t give the motive power, and this weight and its cordwill obviously commence to operate the train as soon as the key isremoved, unless means are provided to prevent the movement of the trainuntil such time as the signal is to be given. I have, therefore, placedupon the barrel-shaft a ratchet-wheel, u, with which enf gages a pawl,a', pivoted to the frame A, and provided with a thumb-piece, u2, bywhich it may be raised. This pawl prevents the operation of the train bythe weight as long as it remains engaged with the ratchet-wheel; and thefirst act, therefore, which is necessary in starting the train is tothrow this pawl back out of engagement with the ratchel-wheel. Thisbeing done the weight may descend to operate the train,and n order thatit may have a sufficient downward movement, the loor or bottom of thebox is provided with a movable section, b, which is attached to the doorb', so that when the door is opened this section will be removed fromunder the weightand give it free passage downward. It will be understoodthat,after a signal is sent, the train is to be wound up ready to give asubsequent signal when required, the necessary operation for giving suchsignalbeing, usually, simply to open the box and throw back the pawl u',as before explained. It may, however, sometimes be necessary to give thetrain an initial movement in assistance of the weight, as it is notdesirable to use a weight so heavy tha-t it will always promptly startthe train. A much smaller weight will suiiice to efiieiently operate thetrain after it is once started than would be required to start itpromptly after the detaining-pawl is thrown back. In order to give thetrain an initial movement, I have arranged under the shaft f, whichcarries thegear-wheel f, a shaft, j, carrying a pinion, f5, meshing withsaid gear-wheel. This shalt has a projecting portion provided with athumb-piece, u, by which it may be turned, and also with aratchet-Wheel, w', with which engages a detent-pawl, w. On openingthebox and turning back the detent-pawl u', the person sending the signalshould turn the thumb-piece w in the direction indicated by the arrow,thus causing the pinion f 5 to turn the gear-wheel f and give an initialmovement to the train. A slight initial assistance only is needed, asthe train being once started, the weight will continue it in operationuntil it runs down. In order that the key forwinding up the barrel maynot be displaced or lost, it is desirable thatitshould remain in thebox; and in order that it should so remain I have provided the door ofthe box with springfinger y, (shown in dottedlines,) which,when the dooris closed, will catch over a shoulder, q', formed Ion the key, and whenthe door is opened will automatically draw the key o the winding-- shaftand release the brake. These springingers will support the key when itis not in use, and it may be readily detached from said fingers whenrequired for winding up the train.

Any of the suitable and well-known devices may be used for determiningthe number ot' revolutions to be made by the break-wheel in giving eachsignal.

Having now described my invention and explained the operation thereof, Iclaim- 1. The combination, with the train of gearing operating thesignaling device, of a brake arranged for application to one of thewheels of such train, and adapted to be thrown into frictional contacttherewith by the insertion of the winding-key, substantially as shownand described.

2. The combination, with the train having the barrel-shaft projectingand adapted to receive a key, of the pivoted bent lever having IIO will

an arm, R, carrying brake arranged for application to one of the Wheelsof the train, and an arm, R', arranged adjacent to the projectingkey-*receiving portionof the windingshaft, and in such position as to bemovedby the key for applying the brake, substantially as shown.

3. The combination, with the Winding barrel and its shaft, of theauxiliary ratchet-wheel u and the pivoted paWl u', provided With athumb-piece, substantially as described, and for the purposeset forth. 4

4. The combination, Awith the actuatingl Weight and thetrain, of theshaftj, carrying the pinion f5, meshing Wit-h one of the wheels of saidtrain, and provided With'a thumb-piece by which it may be turned,whereby an initial movement is given to the train, overcoming JOSEPH R.H; HINTON.

XVitnesses:

H. S. DUNN, Trios. `KELL BRADFORD.

